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Effect of Normalizing Temperature on Microstructure and Mechanical Properties of 11Cr–3Co–2.3W Steel
Author(s) -
Cui Chenshuo,
Gao Xiuhua,
Zhu Chenglin,
Hu Deyong,
Gao Cairu,
Liu Zhenguang,
Misra Raja Devesh Kumar,
Su Guanqiao
Publication year - 2019
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201800555
Subject(s) - microstructure , materials science , cleavage (geology) , dimple , ultimate tensile strength , electron backscatter diffraction , metallurgy , fracture (geology) , composite material
Mechanical properties of 11Cr–3Co–2.3W steel are affected by various parameters, and normalizing temperature is an important parameter. OM, FESEM, EBSD, and TEM are carried out to study the microstructure evolution of 11Cr–3Co–2.3W steel normalized at different temperature ranging from 900 °C to 1150 °C and tempered at 780 °C. The tensile and impact properties are evaluated from the tempered specimens. The results show that an obvious grain coarsening occurs and the tempered strength of 11Cr–3Co–2.3W steel increases with increasing normalizing temperature. The specific strengthening mechanisms are discussed. The fracture morphology shows mainly dimples and cleavage facets, implying mixed‐mode of fracture mechanism when the normalizing temperature is up to 1050 °C. Normalizing at 1150 °C, the mixed‐mode of fracture mechanism is transformed to brittle fracture.